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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/70569/116318/manifest?manifest=/json/iiif/10316.2/70569/116318/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-1b5bb1c9-8c79-4444-aea0-a173b938955f",
      "cw-0bd7d274-3a27-44f9-bd20-ebcdc923599e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-75f0c9a1-9e41-4253-b6ef-ee43c0d2ce80",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/70569/116318/manifest?manifest=/json/iiif/10316.2/70569/116318/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-0bd7d274-3a27-44f9-bd20-ebcdc923599e",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}